I want write matlab code for scattering 20 random points and one line (ezplot (f=a+2*(b)-1.5) ).

The red color must be used for points greater than f (means the area over f) and the blue color for points less than f (means the area under f). This code didn't work:

a=round(-30+[30+30]*rand(1,20)) b=round(-30+[30+30]*rand(1,20)) f=a+2*(b)-1.5 ezplot(f=a+2*(b)-1.5) hold on if f(i)>0 scatter(a,b,'r'); else if f(i)<0 scatter(a,b,'b'); end

whats the correct code?